激光靶等离子体受激Raman散射  

STIMULATED RAMAN SCATTERING IN LASER PLASMA TARGETS

作　　者：张家泰[1] 许林宝[1] 常铁强[1] 张书贵[1] 聂小波[1] 王世红 汪卫星 

机构地区：[1]北京应用物理与计算数学研究所,北京100088

出　　处：《物理学报》1991年第10期1642-1651,共10页Acta Physica Sinica

基　　金：国家自然科学基金

摘　　要：用我们研制的一维半电磁粒子模拟程序数值模拟了神光12~＃激光器(λ_L=1.053μm,τ=850ps,I_L=3×10^(14)—3×10^(45)W/cm^2打靶的受激Raman散射。得到了散射光波、静电(Langmuir)波线性增长和非线性饱和的细致图象、热电子和超热电子分布函数随时间的发展以及超热电子的温度和份额。通过对散射光谱的分析得到晕区电子温度约为1.4—2.5keV,还得到靶等离子体1/4n_c(n_c为临界密度)以下的密度轮廓和平均密度约为0.12—0.14n_c这些结果和实验符合较好。In this paper, an one and a half dimensional (1 1/2-D, one space dimension and two velocity dimension I plasma cloud-in-cell simulation code (CIC) has been developed. It is used to study SRS in laser-plasma targets from the Shenguang-12~# Nd-glass laser facility (λ=1.053μm,τ= 850ps I_L= 3×10^(14)-3×10^(l5)Wcm^(-2)). The results on the linear growth rates of the scattering electromagnetic waves and Lan-gmuir waves and nonlinear saturation are obtained in detail. Other results such as the time development of the electron distribution function and temperature and fraction of hot electron are also presented. In addition,temperature of thermal electron (1.4-2.5keV) in the underdense coronal plasma region is determined by spectrum analysis of SRS light, as well as contour figure for density distribution and average density (0.12-0.14nc,n=1/4n_c). These results agree with experiments.

关 键 词：激光 靶 等离子体 受激拉曼散射 

分 类 号：TL612.12[核科学技术—核技术及应用]